| The thesis brings forward the scheme that combines polarization filter and side lobe canceller to improve the anti-jamming ability of radar. The signal effect in the conventional adaptive side lobe canceller system is studied. To overcome the signal effect, we renovate the auxiliary antenna in the conventional side lobe canceller system to two-orthogonal-channel polarization antenna. After modeling and analyzing the antenna system, analytic expressions evaluating the improvement of polarization filter in performance are derived out. A new adaptive side lobe canceller algorithm combined with polarization filter is proposed in allusion to the system above. Theoretical analysis and computer simulation prove that the scheme can overcome the signal effect and improve the anti-jamming ability of radar system.Then as to the polarization radar, a scheme that deploys omnidirectional two-orthogonal -channel antenna array besides the main antenna is proposed. Thus the main and auxiliary polarization radars form a side lobe canceller system. Based on the modeling of this system, an anti-jamming filter algorithm in the polarization-spatial domain is brought forward. Theoretical analyze and computer simulation prove that the side lobe canceller system using polarization radar can depress jammer while not damaging the signal, the overall performance is better than that of the system using polarization radar only in the auxiliary antenna. |
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